Build America Bonds (BABs) were issued by states and municipalities for twenty months as an alternative to tax-exempt bonds. The program was part of the 2009 fi scal stimulus package. The bonds are taxable to the holder, but the federal Treasury rebates 35% of the coupon payment to the issuer....

This paper documents a new channel for rating-based bond market segmentation which, in contrast to prior research, is based on non-regulatory asset management practices. A 2005 Lehman Brothers index redefinition provides a quasi-natural experiment in which a number of previously high-yield...